Monte Carlo calculations for the shielding design of beam injection and extraction areas at the 3-GeV synchrotron in J-PARC

Nakane, Yoshihiro  ; Abe, Teruo*; Nakashima, Hiroshi

For the shielding design of 3-GeV synchrotron in J-PARC, radiation shielding calculations were performed around beam injection and beam extraction areas. It is difficult to apply the simplified methods for these areas that the geometries are complicated and the larger beam losses are assumed. Therefore, Monte Carlo code, PHITS, were applied to particle transport calculations for the shielding designs around those areas. The shielding designs were performed with the condition that the maximum dose rates at the boundary of radiation controlled areas are in less than both the design criterion defined in J-PARC and the limit defined in regulation of Japan. Calculation methods and conditions used for the shielding design and the calculation results are presented in this work.